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R30021 Cobalt vs. ACI-ASTM CE30 Steel

R30021 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CE30 steel belongs to the iron alloys. They have a modest 32% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is ACI-ASTM CE30 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 9.0
11
Fatigue Strength, MPa 250
170
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 86
79
Tensile Strength: Ultimate (UTS), MPa 700
630
Tensile Strength: Yield (Proof), MPa 500
310

Thermal Properties

Latent Heat of Fusion, J/g 330
310
Melting Completion (Liquidus), °C 1350
1410
Melting Onset (Solidus), °C 1190
1360
Specific Heat Capacity, J/kg-K 450
490
Thermal Conductivity, W/m-K 15
14
Thermal Expansion, µm/m-K 11
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.4

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.0
3.4
Embodied Energy, MJ/kg 110
49
Embodied Water, L/kg 520
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
59
Resilience: Unit (Modulus of Resilience), kJ/m3 570
240
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23
23
Strength to Weight: Bending, points 21
21
Thermal Diffusivity, mm2/s 3.8
3.6
Thermal Shock Resistance, points 21
13

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.3
Chromium (Cr), % 26 to 29
26 to 30
Cobalt (Co), % 61.7 to 67.3
0
Iron (Fe), % 0 to 3.0
55.1 to 66
Manganese (Mn), % 0
0 to 1.5
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
8.0 to 11
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.5
0 to 2.0
Sulfur (S), % 0
0 to 0.040